Dishwashing device



Dec. 18, 1962 s. s. NORD DISHWASHING DEVICE Filed Sept. 29, 1959 Marl/M United States Patent 3,069,096 DISHWASHlN G DEVICE Sven Gustav Nord, Majorsgatan 26 D, Gavle, Sweden Filed Sept. 29, 1959, Ser. No. 843,129 Claims priority, application Sweden Sept. 30, 1958 3 Claims. (Cl. 239-315) The present invention relates to dishwashing devices.

It has proved in practice that in cleaning e.g. dishes or the like, chemicals included in the cleansing liquid have a very moderate efiect if they are too diluted. If a small but determined or exact quantity of dishwas-hing chemicals or a composition in the form of a solid substance or a fiuid concentrate is used for cleaning a certain quantity of dishes suitably placed in a dishwashing machine of the type which is provided with a rotatable spraying device, and in which the cleansing liquid is leaving the machine at the same rate at which the liquid is being sprayed from the spraying holes of the spraying device, the dishwashing chemicals shall hit the dishes in a certain concentration which must not be too low if the time necessary for carrying out the dishwashing operation is to be short enough and the power supply (necessary for de veloping the required velocity of the liquid sprays) is not too great.

It is one object of the present invention to provide a new and useful dishwashing device. According to the present invention the chemicals and the mechanical parts of the dishwashing work are combined with each other, so that the time and the costs required for the washing will be considerably diminished.

According to the present invention the dishwashing solution is sprayed on the dishes in a concentration which is not too low, suitably in the form of a curtain and intermittently, so that this dishwashing curtain will be swept over the dishes alternating with rapid liquid beam-s or sprays mechanically acting upon the surfaces of the dishes. In that way the impurities on the dishes will be efficiently and rapidly loosened, dissolved, emulgated or otherwise removed from the dishes and flushed away.

It is another object of the present invention to utilize the effect of two or more different chemicals which in the form of concentrated solutions sprayed as curtains one after another against the dishes will improve the cleansing process by acting on difierent sorts of impurities. The different types of chemicals may of course be chosen such that a chemical reaction will be brought about between them when they are combined with each other. This reaction may appear as gas evolution, precipitation or fluctuation of the temperature. Soda and citric acid develop carbon dioxide between the impurities and the surfaces of the dishes, whereby the impurities are easily removed later by flushing the dishes.

It is still another object of the present invention to provide a dishwashing device which comprises a rotatable sprayer or spraying device. in one arm of the sprayer, the length of which is about one half of the length of another sprayer arm, there is arranged a chamber into which a dishwashing means, suitably in the form of a tablet, can be inserted, whereafter the chamber is closed so that the cleansing water or liquid led into the sprayer will pass the dishwashing tablet slowly dissolving the latter, whereafter the comparatively concentrated cleansing liquid will leave the sprayer device through a sprayer hole adapted in a manner known per se to spread or diverge the liquid like a fan with a great top angle. The rotating curtain of dishwashing solution will through the rotation satisfiactorily cover the surfaces of the dishes.

With these and other objects in view, which will become apparent in the following detailed description, the present invention will be clearly understood in connection with the accompanying drawing, in which:

3,059,096 Patented Dec. 18, 1962 FIGURE 1 is an elevation of the sprayer device as connected to a liquid supply pipe;

FIG. 2 is a sectional view of the outer end of one of the sprayer arms, provided with a chamber for a tablet; and

FIG. 3 is a section along the lines 33 of FIG. 2.

Referring now to the drawing, and at first to FIG. 1, the sprayer device is rotatably mounted on the end of a liquid supply pipe 11 and it has two tubular and counterbalanced larms 1 and 2 of different lengths. A single hole 3 at the outer end of the shorter arm 1 is adapted to spray a fan-like beam of a solution of dishwashing chemicals on to the dis-hes (not shown).

The solution is formed by cleansing liquid, e.g. water, which is passing around and dissolving a tablet 4 consisting of a composition or chemicals suitable to improve the dishwashing properties of the liquid. The tablet 4 is received in a chamber 5 provided at the outer end of the arm 1, which chamber 5 is confined by the inner walls of the tubular arm 1 :and two perforated walls 6 and 7 inserted into the arm 1. The tablet 4 can be inserted through a hole 3 provided in the wall of the arm 1. A rotatable sleeve 9 (FIG. 3) closes the hole 8, the sleeve 9 having, however, a hole 10 which can be located in alignment with the hole 8 by turning suitably the sleeve 9. When the holes 8 and 10 .are aligned, the tablet 4 can easily be inserted therethrough into the chamber 5.

It will be understood that the liquid flow from the supply pipe 11 will be continuously streaming through the perforated walls 6 and 7 and accordingly around the tablet 4, slowly dissolving the latter, before reaching the outlet spraying hole 3. The other arm 2 of the sprayer will receive and expel only pure liquid or water, and accordingly, the sprayer will cause the dishes to be hit alternatingly by the solution of the tablet 4 and by pure liquid in accordance with the principle of the present in vention.

The sleeve 9 may suitably consist of plastics, rubber or the like which will exert a certain friction on the tube 1.

The arm 2 may have any selected long series of spraying holes 2.

As indicated above, it is possible to use chemicals which react chemically with each other. Such reactions should occur before the various chemicals have left the sprayer arm 1. Thus, eg the forming of carbon dioxide may improve the velocity and spraying of the cleansing liquid. In the households hardly any other chemicals than cheap ones will be used. Of course, also liquid concentrates of dishwashing chemicals may be placed in the sprayer arm 1. Thus, they may be absorbed in absorbing substances or enclosed in capillaries, whereby slow dissolving is ensured. The dissolving time of the tablets may be varied according to the circumstances; normally the tablet should be dissolve in about 1.5 to 2 minutes in water of about 40 C. and the normal water pressure which is conventional in water pipes. The tablets may also have the character of drages.

While I have disclosed one embodiment of the present invention, it is to be understood that this embodiment is given by example only and not in a limiting sense, the scope of the present invention being determined by the objects and the claims.

I claim:

1. A dishwashing device comprising a water feeding pipe, a sprayer device having at least two tubular arms extending perpendicularly from said water feeding pipe in opposite directions and ro-tatably mounted on one end of said water feeding pipe, at least one of said arms having an opening at its free end and forming a chamber between the point of mounting of said sprayer device and the free end of one of said arms, said chamber including means permitting flow of water therethrough and being adapted to receive a chemical suitable to enhance the dishwashing properties of water fed through said one of said arms, a spray opening at the free end of said one of said arms and a plurality of spray openings disposed axially spaced apart from each other along the other of said arms, so that, upon rotation of said sprayer device about said water feeding pipe, chemically treated water is sprayed alternately with clear water onto dishes by said respective arms.

2. The dishwashing device, as set forth in claim 1, wherein said one of said tubular arms has an opening within the range of said chamber, said opening being adapted to receive said chemical, and a sleeve surrounding said one of said tubular arms to close said opening upon inserting said chemical into said chamber.

3. The dishwashing device, as set forth in claim 1, which includes two perforated walls in said one of said arms, said walls being disposed spaced apart from each other and perpendicularly to the longitudinal axis of said one of said arms and constituting the end walls of said 4 chamber, said walls permitting flow of water through said chamber simultaneously dissolving said chemical disposed in said chamber.

References Cited in the file of this patent UNITED STATES PATENTS 58,375 Cahill Oct. 2, 1866 1,408,077 Clinton Feb. 28, 1922 1,633,669 Irvin June 28, 1927 1,726,930 Smith Sept. 3, 1929 1,980,065 Johnston Nov. 6, 1934 1,993,923 Eccardt Mar. 12, 1935 2,038,260 Ash Apr. 21, 1936 2,385,264 Ferris Sept. 18, 1945 2,573,687 Brock Nov. 6, 1951 2,610,894 Hall Sept. 16, 1952 2,622,928 Misch Dec. 23, 1952 2,624,619 Fletcher Jan. 6, 1953 2,718,481 Tuthill Sept. 20, 1955 2,787,499 Rolston Apr. 2, 1957 

